Transmission device



Patented lil/far. 29, 1923.

WILLIAli/ E. KELLY, OF OAKLAND, CALIFORNIA.

TRANSMISSION DEVICE.

Application filed March 16, 1920. Serial No. 366,254.

T0 all whom t may concern:

Be it known that l', Winmiiiir KELLY, a citizen of the `United States, and a resident of Oakland, county of Alameda, and State of California, have invented a new and useful rransniission Device, of which the following is a specification. l n

lvly inventicn relates to transmission mechanism and one of the objects of the invention is to provide an improved transmission device for connecting the rotary brush of a vacuum cleaner to the motor. Another object is to provide a transmission device of the character describet characterized by noiseless operation, long wear and reliability in service and low production costs.

The invention possesses other objects and features of advantage, some of which, with the foregoing, will be set forth in the following description of the preferred form of my invention which is illustrated in the drawings accompanying and forming part of the. specification. 1t is to be understood that l do not limit myself to the showing made by the said drawings and description, as l may adopt variations of the preferred form within the scope of my invention as set forth in the claims.

Referring to the drawings: f

Figure 1 is a side elevation of my brush driving attachment, showing the device applied to a cleaning machine. Figure 2 is an end elevation of the device.

My transmission device comprises a plate 2 adapted to be secured to the motor casing 3 of the vacuum cleaner 4l by screws in such manner that the motor shaft 6 projects through suitable opening 7 therein. The plate is preferably circular in form, to coincide with the shape of the motor casing, and is formed with apertures 8 to lighten the weight thereof. Projecting from the upper and lower edges of the plate are arms 9 and 10 in which the shaft 12 is mounted for rotary and axial movement in oiled wood bushings 13. The lower end of the shaft is provided with a pulley 14 connected by belt 16 with the brush 17.

Fixed on the motor shaft 6 is a friction disk 18 adapted to engage friction disk 19 fixed on the shaft 12. Preferably the disks are made of fiber and with beveled peripheries, the one onthe motor shaft being smaller than the other to effect a considerable reduction in speed.

The shaft 12 is provided with a head 21, between which and a washer 22 surrounding the shaft and bearing on the arm 9, is a coil spring 23, the function of which is to resiliently engage the disk 19 with the disk 18. Thus the disks are retained in resilient engagement and rotation of the motor shaft turns the shaft 12 at a much lower speed, the belt 16 transmitting the motion to the brush with a still further drop, so that the brush speed is at the desired ratio to the motor speed.

Means are provided for disengagin'g the disk 19 from the disk 18 and retaining it in the disengaged position, at such times as it is desired to operate the cleaner without turning the brush. Pivotally mounted on the lugs 24 on the plate 2 is an arm 26, overlying the head of the shaft 12. A spring 27 interposed between the arm and the plate tends to move the arm out of contact with the shaft head. The outer end of the arm is provided with a pivoted latch 28, manually movable by the knob 29, and adapted to engage the end of the arm 9 when the arm 26 is pressed downwardly against the shaft head. Vhen this yis done, the shaft 12 is moved downwardly against the resistance of the spring 23, and the disk 19 disengages from disk 18, so that the motor shaft runs free. When the cleaner is once more to be used with the rotating brush, the latch 28 is released and the spring 23 at once effects the axial movement of the shaft 12 to again resiliently engage the friction disks, the arm 26 being raised clear of the shaft by the s aring 27.

'i' claim:

1. A transmission device for connecting the rotary brush to the motor in a vacuum cleaner, comprising` an axially movable shaft, means connecting the brush for rotattion with the shaft, friction disks arranged on said shaft and the motor shaft, a spring for pressing said axially movable shaft to resiliently engage said disks. a spring pressed arm for moving said axially movable shaft to disengage said disks, and a latch for retaining said arm in position.

2. A transmission device for connecting the rotary brush to the motor in a vacuum cleaner, comprising a plate adapted to be secured to the cleaner, a shaft journaled for rotary and axial movement on said plate, a pulley on said shaft, a belt for connecting said pulley to said brush, a fricllO tion disk on the motor shaft, a second friotion disk on said axially movable shaftJ adaptedto be driven from said motor shaft disk, a spring interposed between said plate and said shaft journaled thereon for resiliently engaging said disks, a spring pressed arm pvoted on said plate for moving said axially movable shaft to disengage said disks and a manually operated latch for looking said arm in position.

In testimony whereof, I have hereunto set my hand.

WILLIAM E. KELLY. 

